discussion: AlignerTransforms

[djkapner]

I thought you might be interested in this, when wanting to add polynomial transforms to EMaligner, I re-worked it to better handle transforms in general. Now there are AlignerTransforms that inherit from render-python transforms. These AlignerTransforms have all the machinery to buildup Ax=b matrices from pointmatches, amongst other things.
I'm not in the habit of subjecting you two to code review of EMaligner, but, comments are welcome. Otherwise, just be happy EMaligner is now even more a child of render-python...
https://github.com/AllenInstitute/EM_aligner_python/tree/add_poly2D_transform/EMaligner/transform